To bore a reference hole and a product hole in a position relationship of a high precision in any case of a gang die boring method and a grid pattern boring method.

In this multi spindle boring device, which is provided with a moving die 21, which holds plural punches 1 for product hole and reciprocates by driving a strike drive source 10, a fixed die 30 fixedly provided for the reciprocation of the moving die 21 and simultaneously performs many borings to a work W, a reference hole boring part 40, which bores a reference hole by a punch 41a for reference hole independently reciprocating to/from the moving die 21, is integrally provided in the fixed die 30, the position precision of both the punch 1 and the punch 41a hole is secured.